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CRIU and GDB need to get the current shadow stack and WRSS enablement status. This information is already available via /proc/pid/status, but this is inconvenient for CRIU because it involves parsing the text output in an area of the code where this is difficult. Provide a status arch_prctl(), ARCH_SHSTK_STATUS for retrieving the status. Have arg2 be a userspace address, and make the new arch_prctl simply copy the features out to userspace. Suggested-by: Mike Rapoport <rppt@kernel.org> Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by: Kees Cook <keescook@chromium.org> Acked-by: Mike Rapoport (IBM) <rppt@kernel.org> Tested-by: Pengfei Xu <pengfei.xu@intel.com> Tested-by: John Allen <john.allen@amd.com> Tested-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/all/20230613001108.3040476-43-rick.p.edgecombe%40intel.com
44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _ASM_X86_PRCTL_H
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#define _ASM_X86_PRCTL_H
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#define ARCH_SET_GS 0x1001
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#define ARCH_SET_FS 0x1002
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#define ARCH_GET_FS 0x1003
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#define ARCH_GET_GS 0x1004
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#define ARCH_GET_CPUID 0x1011
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#define ARCH_SET_CPUID 0x1012
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#define ARCH_GET_XCOMP_SUPP 0x1021
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#define ARCH_GET_XCOMP_PERM 0x1022
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#define ARCH_REQ_XCOMP_PERM 0x1023
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#define ARCH_GET_XCOMP_GUEST_PERM 0x1024
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#define ARCH_REQ_XCOMP_GUEST_PERM 0x1025
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#define ARCH_XCOMP_TILECFG 17
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#define ARCH_XCOMP_TILEDATA 18
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#define ARCH_MAP_VDSO_X32 0x2001
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#define ARCH_MAP_VDSO_32 0x2002
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#define ARCH_MAP_VDSO_64 0x2003
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/* Don't use 0x3001-0x3004 because of old glibcs */
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#define ARCH_GET_UNTAG_MASK 0x4001
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#define ARCH_ENABLE_TAGGED_ADDR 0x4002
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#define ARCH_GET_MAX_TAG_BITS 0x4003
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#define ARCH_FORCE_TAGGED_SVA 0x4004
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#define ARCH_SHSTK_ENABLE 0x5001
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#define ARCH_SHSTK_DISABLE 0x5002
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#define ARCH_SHSTK_LOCK 0x5003
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#define ARCH_SHSTK_UNLOCK 0x5004
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#define ARCH_SHSTK_STATUS 0x5005
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/* ARCH_SHSTK_ features bits */
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#define ARCH_SHSTK_SHSTK (1ULL << 0)
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#define ARCH_SHSTK_WRSS (1ULL << 1)
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#endif /* _ASM_X86_PRCTL_H */
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